Receive emails only from anti spam server

Question

iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)
libimta.so 5.2 Patch 2 (built 19:30:12, Jul 14 2004)
I have a Symantec Security Email which is also an anti spam server..all incoming email from outside are supposed to go to this server first before reaching messaging server..the problem is some of the spam emails bypass the anti spam server
My question is could I configure messaging server to only accept emails from the anti spam server and reject email that bypass the server ?
Thank you

Answer 1

I have the same problem as spams bypass our anti-spam firewall and send to our email server directly.
To solve this trouble, I want to edit entries in the mapping table.
Considering we also have MS Outlook users, would the following mapping tables work for us?
PORT_ACCESS
! 10.100.100.100 is our anti-spam firewall before the mail server
! this is to enable mails from the anti-spam firewall to get through
TCP|*|25|10.100.100.100|* $Y
!This is to enable normal MS Outlook users to send emails from port 25
TCP|*|25|127.0.0.1|* $Y
!This is too, to enable normal MS Outlook users to send emails from port 25
! 10.100.100.200 is our mail server, would this entry be necessary?
TCP|*|25|10.100.100.200|* $Y
! This is to reject other connections to the mail server's port 25
TCP|*|25|*|* $NInternet$ access$ not$ permitted
Would it work for my goal?
Thanks.
It is iMS5.2.